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(N9 Model) No. 366,028. Patented July 5, 1887. v

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N. PETERS, Phokn lilhognph UNITED STATES PATENT QFFIGEQ CLARK FREERIGBY, OF FOXBURG, PENNSYLVANIA, ASSIGNOR OE THREE- EIGHTHS TO LEVIS\VATSON RAISON, \VILLIAM ALEXANDER WSTOFER, AND JOHN M. HARPER, ALL OFSAME PLACE. v

* STEAlVt-VALVE.

SPECIFICATION forming part Of Letters Patent N0. 366,028, dated July 5,1887.

Application filed March 24, 1887. Serial No. 232,241. (No model.)

useful Improvementsin Steam-Valves; and I do hereby declare thefollowing to be a full, clear,

and exact description ofthe invention, suchas will enable others skilledin the art to which 1t pertains to make and use it, reference being hadto the accompanying drawings, which form part of this specification.

My invention relates to an improvement in steam-valves; and it consistsin the combina tion of the Valve-chest, which is made tubular in shapeand provided with inlet and exhaust ports, with the valve, which isformed of two shells which are placed one inside of the other andprovided with corresponding inlet and exhaust ports, the concave headswhich are placed inside of the valves, and suitable packing-rings, aswill be more fully described here inafter.

Figures 1 and 2 are vertical sections of the cylinder and valveembodying my invention, the valve being shown in different positions.Fig. 3 is a side elevation of the valve alone.

A represents the valve-chest,which is made tubular in shape, and whichis closed at both of its-ends, and provided with two ports through itsside for the free admission of thesteam to the ends of the valve.Through this chest are made the inlet ports 0 and the exhaust-port D. Inthe inner surface of this chest, and extending entirely around, are madegrooves which correspond to the ports 0 D, so that the steam can passentirely around the valve and enter freely at all of its ports.

The valve E is formed of two concentric split rings, G H, which areprovided with inlet and exhaust ports to correspond to the ports in thechest, and in each end of the two shells is placed a eoncaved head, I,which extends inward beyond theinlet-port C. These heads are providedwith openings or ports J, which extend to the inlet-ports C, so thatwhen thelive steam enters either one of the ends of the chest it willpass into one of the heads I through the ports J C. These head I serveto separate the live from the exhaust steam, and

in order to form a perfectly-tight joint between the head and the innershell, H, suitable packing-rings, L, are used. The two heads areconnected together by the valve-rod N, by means of whichthe valve ismoved back and forth in the chest. The ends of the headsI bear againstthe valve extensions or supports 0, formed upon the ends of the twoshellsG II, as shown. In the outer surface of each head there is cut agroove, which is to be filled with soft metal, which forms a seat forthe packing rings. WVhen the valve is being repaired, this seat can bereadily removed and a new one inserted.

Inorderto prevent a leakage between the edges of the outer shell, G,suitable recesses are made in its edges, and in these recesses areplaced small plates Q,which extend across the opening between the edgesof the shell, and thus prevent any passage of steam back and forthbetween the inlet and exhaust ports. \Vhen the valve is moved endwiseinto one position, the inlet-ports are closed and the exhaust-port isopened, andwhen the valve is moved endwise in the opposite direction theexhaust-port is closed and the inlet-ports are opened. The extensions 0upon the valvesupport the center and the ends of the valve and nevertravel past or over the steam-ports.

The two shells G H are used, so that when the valve becomes worn theouter shell, G, can be removed and replaced by another, and thus apractically new valve is made, for none of the interior parts have to beremoved, nor do they have any wear, as they have no movement of theirown. The outer shell, G, is turned largerthan the bore of thesteam-chest and split lengthwise, so that it can he forced toshell, G.When the steam'chest has been bored so often that it becomes too large,a bushing can be placed inside of it, so as to fit the valve. Havingthus described my invention, I clain1 1. The combination of the twoshells e H, r

provided with the extensions 0 upon their G H, provided with inlet andexhaust ports, ends and having the exhaust ports and paswith theconcaved heads I, also provided with sages, with the concaved headswhich are inlet-ports and suitable packing-rings, and the placed insideof the shells, substantially as plates Q, which are inserted in theedges of .r 5 i 5 shown. the outside shell, substantially as set forth.

2. The combination of the two shells G H In testimony whereofIaffix mysignaturein with the concaved heads I, placed therein and presence oftwo witnesses. provided with suitable packing-rings, and. the CLARK FREERIGBY. groove which is filled with soft metal, sub- Vitnesses: 1ostantially as described. W. A. STOFER, 3. The combination of the twosplit shells J. M. HARPER.

